:root {
  --bg: #f6f4ef;
  --ink: #1b1b1f;
  --muted: #5c5f66;
  --accent: #2f5d50;
  --card: #ffffff;
  --line: #d8d5ce;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Source Sans 3", "Segoe UI", sans-serif;
  --display: "Fraunces", Georgia, serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(47, 93, 80, 0.12), transparent 40%),
    linear-gradient(180deg, #efebe3 0%, var(--bg) 30%, #f8f7f4 100%);
  line-height: 1.55;
}
.hero, main, footer, .toc {
  width: min(860px, calc(100% - 2rem));
  margin-inline: auto;
}
.hero { padding: 3.5rem 0 1.5rem; }
.eyebrow {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
h1 {
  font-family: var(--display);
  font-weight: 560;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.05;
  margin: 0 0 0.75rem;
}
.lede { max-width: 38rem; color: var(--muted); margin: 0; }
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 0 1.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}
.toc a {
  color: var(--ink);
  text-decoration: none;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  background: var(--card);
}
.toc a[aria-current="page"] {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
section {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.25rem 1.35rem;
  margin-bottom: 1rem;
}
h2 { margin-top: 0; font-size: 1.2rem; }
a { color: var(--accent); }
pre {
  background: #1b1b1f;
  color: #f4f1ea;
  padding: 1rem;
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.9rem;
}
footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}
ul { padding-left: 1.2rem; }
li { margin: 0.35rem 0; }